Light guiding mechanism for portable electronic device

Abstract

A light guiding mechanism for portable electronic device includes a cover, a light guiding module and four light sources. The cover includes a light transmitting region. The light guiding module includes a light guide plate having a first diagonal line and a second diagonal line. The light guide plate defines a first through hole. The light guide plate includes a light reflecting region around the first through hole. The light reflecting region includes a plurality of protrusions symmetrically positioned relative to the first diagonal line and the second diagonal line. Adjacent protrusions have a space therebetween. The size of the space uniformly increases with increasing distance from the first through hole. Light emitted from the light sources is repeatedly reflected by the protrusions and then passes the light transmitting region of the cover.

1. A light guiding mechanism for portable electronic device comprising:
 a cover including a light transmitting region; 
 a light guiding module including a light guide plate having a first diagonal line and a second diagonal line, the light guide plate defining a first through hole; the light guide plate including a light reflecting region around the first through hole, the light reflecting region disposed beneath the light transmitting region of the cover; the light reflecting region including a plurality of protrusions symmetrically positioned relative to the first diagonal line and the second diagonal line; adjacent protrusions having a space therebetween, the size of the space uniformly increasing with increasing distance from the first through hole; and 
 four light sources correspondingly adjacent to four sides of the light guide plate, light emitted from the light sources being repeatedly reflected by the protrusions and then passing the light transmitting region of the cover. 
 
     
     
       2. The light guiding mechanism as claimed in  claim 1 , wherein the light guiding module further comprises a transparent film, the transparent film attached to the light guide plate, and the transparent film defining a plurality of grooves for partially receiving the protrusions correspondingly. 
     
     
       3. The light guiding mechanism as claimed in  claim 2 , wherein the light guide plate defines four cutouts at edges thereof, the transparent film defines four notches corresponding to the cutouts, and each of the light sources is received in a combination space of the cutout and the corresponding notch. 
     
     
       4. The light guiding mechanism as claimed in  claim 3 , wherein each pair of the adjacent protrusions has a pair of parallel edges facing each other. 
     
     
       5. The light guiding mechanism as claimed in  claim 4 , wherein the protrusions includes first protrusions and second protrusions, the first protrusions are hexagonal having three pairs of parallel edges, and the second protrusions lie on the first diagonal line and the second diagonal line. 
     
     
       6. The light guiding mechanism as claimed in  claim 1 , further comprising a printed circuit board, wherein the light sources are fixed on the printed circuit board, and the light guiding module is attached to the printed circuit board. 
     
     
       7. The light guiding mechanism as claimed in  claim 1 , further comprising a display module, wherein the light guiding module defines a through hole, and the display module is received in the through hole. 
     
     
       8. The light guiding mechanism as claimed in  claim 7 , wherein the display module comprises a gasket, a display and a fixing member, the display is fixed to the fixing member, and the gasket is between the cover and the gasket. 
     
     
       9. The light guiding mechanism as claimed in  claim 8 , wherein the cover defines a display window corresponding to the display, the light transmitting region including a plurality of apertures around the display window. 
     
     
       10. The light guiding mechanism as claimed in  claim 1 , wherein the light sources are light emitting diodes. 
     
     
       11. A light guiding mechanism for portable electronic device comprising:
 a cover including a light transmitting region; 
 a light guide plate having a first diagonal line and a second diagonal line and defining a first through hole; the light guide plate including a plurality of protrusions, the protrusions being around the first through hole and symmetrically positioned relative to the first diagonal line and the second diagonal line; the protrusions being beneath the light transmitting region; adjacent protrusions having a space therebetween, the size of the space uniformly increasing with increasing distance from the first through hole; and 
 four light sources correspondingly adjacent to four sides of the light guide plate, light emitted from the light sources being repeatedly reflected by the protrusions and then passing the light transmitting region of the cover. 
 
     
     
       12. The light guiding mechanism as claimed in  claim 11 , further comprising a printed circuit board, wherein the light guide plate is attached to the printed circuit board, and the light sources are fixed on the printed circuit board. 
     
     
       13. The light guiding mechanism as claimed in  claim 12 , further comprising a transparent film attached to the printed circuit board, wherein the transparent film defining a plurality of grooves for partially received the protrusions correspondingly. 
     
     
       14. The light guiding mechanism as claimed in  claim 13 , wherein the light guide plate defines four cutouts at edges thereof, the transparent film defines four notches corresponding to the cutouts, and each of the light sources is received in a combination space of the cutout and the corresponding notch. 
     
     
       15. The light guiding mechanism as claimed in  claim 14 , wherein each pair of the adjacent protrusions has a pair of parallel edges facing each other. 
     
     
       16. The light guiding mechanism as claimed in  claim 15 , wherein the protrusions includes first protrusions and second protrusions, the first protrusions are hexagonal having three pairs of parallel edges, and the second protrusions lie on the first diagonal line and the second diagonal line. 
     
     
       17. The light guiding mechanism as claimed in  claim 12 , further comprising a display module, wherein the light guiding module defines a through hole, and the display module is received in the through hole. 
     
     
       18. The light guiding mechanism as claimed in  claim 17 , wherein the display module comprises a gasket, a display and a fixing member, the display is fixed to the fixing member, and the gasket is between the cover and the gasket. 
     
     
       19. The light guiding mechanism as claimed in  claim 16 , wherein the cover defines a display window corresponding to the display, the light transmitting region including a plurality of apertures around the display window. 
     
     
       20. The light guiding mechanism as claimed in  claim 12 , wherein the light sources are light emitting diodes.